Ron Estes, Kansas state treasurer, won the special election to fill the seat vacated by Mike Pompeo, the new C.I.A. director, in a district that President Trump carried by 27 points. Read full story »

Republicans currently hold the House. Democrats would need to gain 24 seats by the 2018 midterm elections to retake it. There are four special elections for House seats this year for seats held by Republicans. Here’s the 2017 election calendar »